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-rw-r--r--toolkit/components/reader/AboutReader.jsm9
1 files changed, 3 insertions, 6 deletions
diff --git a/toolkit/components/reader/AboutReader.jsm b/toolkit/components/reader/AboutReader.jsm
index 6ec959eba..4cc9d6750 100644
--- a/toolkit/components/reader/AboutReader.jsm
+++ b/toolkit/components/reader/AboutReader.jsm
@@ -276,13 +276,10 @@ AboutReader.prototype = {
},
_setFontSize(newFontSize) {
- let containerClasses = this._containerElement.classList;
-
- if (this._fontSize > 0)
- containerClasses.remove("font-size" + this._fontSize);
-
this._fontSize = newFontSize;
- containerClasses.add("font-size" + this._fontSize);
+ let size = (10 + 2 * this._fontSize) + "px";
+
+ this._containerElement.style.setProperty("--font-size", size);
return AsyncPrefs.set("reader.font_size", this._fontSize);
},